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With this query you get the parameters of procedures and functions in the package:
SELECT * FROM user_arguments
WHERE package_name = 'PKG_VALIDATION' ;

With this query you get procedures and functions in the package:
SELECT object_name,
decode(min(position),0,'FUNCTION',1,'PROCEDURE',null) TYPE
FROM user_arguments
WHERE package_name = 'PKG_VALIDATION'
GROUP BY object_name;